hi i bough a cheapo breadboard power supply off the bay which supplies 3.3 vand 5 v.now when i ramp up the volts the 3.3v is mostly constant off the 3.3 v reg.(can be 9v supplied)but when i ramp up the v on the 5 v reg its never 5v but can be 7v or more ,so is my 5v reg faulty ?should it only give 5v no matter how much i feed it ?in which case i need to replace it .within reason of course of the regs data sheet parameters ..

"is my 5v reg faulty"Possibly.Are you running it with no load? Try adding 1K resistor for 5mA load, see if it does the same.Do you have any input & output capactitors on it? You may need those as well. Check the datasheet on the part.http://www.advanced-monolithic.com/pdf/ds1117.pdf